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Syncrowave 250 wiring question

I have a syncrowave 250 that was purchased used from a manufacturing facility. It was taken from the production line and has been stored for approx. 18mos.

I have a copy of the owner's manual and followed the guide for a 220v hookup, I have reconfigured the jumpers accordingly. Upon switching on the power, the 50a circuit breaker used to supply current to the welder trips instantly.

I am aware that the machine requires 74A at full load, but does it require more than 50A at start-up with no output load?

The machine is wired with a 50A outlet and approximately 20' of #6 cord, and I verified the open circuit voltage at the line-in lugs.

I have read the thread about adequate power hookups, the debate about using 50A plugs, etc...

I'm not an electrian or even a qualified welder, but I am a maintenance guy. After read this the first thing I would check is the connections you made. I've gotten to the point where I thought I was right and it didn't work. I recheck my work find out I flubbed up a step or a wire fix it and it works. Not saying anything against you but it happens.

You might check and see if yours has the power factor correction caps. If it does that mighr explain the trip

The pf caps make the machine efficient at its rated capacity but inefficient at idle/low heat settings. I am not sure if the caps would make it draw more than 50a at idle but something to consider. I run a Lincoln tig 275 off of a 50a breaker and easily get 150a output before tripping the breaker (no pfc)

Thanks for the help. I didn't think of power correction caps. The machine came from a major manufacturing facility and that is a likely possibility. I have been over and over the connections without discovering a problem thus far.

For those who are wired to 220v, the jumpers are across the lower two pairs of terminals if you look at the connection board the way it is mounted in the welder. Does this sound familiar?

The pf caps make the machine efficient at its rated capacity but inefficient at idle/low heat settings. I am not sure if the caps would make it draw more than 50a at idle but something to consider. I run a Lincoln tig 275 off of a 50a breaker and easily get 150a output before tripping the breaker (no pfc)

I was thinking the pfc's would draw a few amps on start up. They should have bleeder resisters to discharge them when the power is off. ( safety )

Blow the welder out real good before turning it on again. It is amazing what dust & cob webs will do to short things out. I had a similar thing happen to my 330 ABP but instead of tripping the breaker it would blow the main control fuse. If my welder sits for any length of time I blow it out before using it.